1 //===-- SystemZISelLowering.cpp - SystemZ DAG Lowering Implementation -----==//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the SystemZTargetLowering class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "systemz-lower"
16 #include "SystemZISelLowering.h"
18 #include "SystemZTargetMachine.h"
19 #include "SystemZSubtarget.h"
20 #include "llvm/DerivedTypes.h"
21 #include "llvm/Function.h"
22 #include "llvm/Intrinsics.h"
23 #include "llvm/CallingConv.h"
24 #include "llvm/GlobalVariable.h"
25 #include "llvm/GlobalAlias.h"
26 #include "llvm/CodeGen/CallingConvLower.h"
27 #include "llvm/CodeGen/MachineFrameInfo.h"
28 #include "llvm/CodeGen/MachineFunction.h"
29 #include "llvm/CodeGen/MachineInstrBuilder.h"
30 #include "llvm/CodeGen/MachineRegisterInfo.h"
31 #include "llvm/CodeGen/PseudoSourceValue.h"
32 #include "llvm/CodeGen/SelectionDAGISel.h"
33 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
34 #include "llvm/CodeGen/ValueTypes.h"
35 #include "llvm/Target/TargetOptions.h"
36 #include "llvm/Support/Debug.h"
37 #include "llvm/Support/ErrorHandling.h"
38 #include "llvm/Support/raw_ostream.h"
39 #include "llvm/ADT/VectorExtras.h"
42 SystemZTargetLowering::SystemZTargetLowering(SystemZTargetMachine &tm) :
43 TargetLowering(tm, new TargetLoweringObjectFileELF()),
44 Subtarget(*tm.getSubtargetImpl()), TM(tm) {
46 RegInfo = TM.getRegisterInfo();
48 // Set up the register classes.
49 addRegisterClass(MVT::i32, SystemZ::GR32RegisterClass);
50 addRegisterClass(MVT::i64, SystemZ::GR64RegisterClass);
51 addRegisterClass(MVT::v2i32,SystemZ::GR64PRegisterClass);
52 addRegisterClass(MVT::v2i64,SystemZ::GR128RegisterClass);
55 addRegisterClass(MVT::f32, SystemZ::FP32RegisterClass);
56 addRegisterClass(MVT::f64, SystemZ::FP64RegisterClass);
59 // Compute derived properties from the register classes
60 computeRegisterProperties();
62 // Set shifts properties
63 setShiftAmountType(MVT::i64);
65 // Provide all sorts of operation actions
66 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
67 setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
68 setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
70 setLoadExtAction(ISD::SEXTLOAD, MVT::f32, Expand);
71 setLoadExtAction(ISD::ZEXTLOAD, MVT::f32, Expand);
72 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
74 setLoadExtAction(ISD::SEXTLOAD, MVT::f64, Expand);
75 setLoadExtAction(ISD::ZEXTLOAD, MVT::f64, Expand);
76 setLoadExtAction(ISD::EXTLOAD, MVT::f64, Expand);
78 setStackPointerRegisterToSaveRestore(SystemZ::R15D);
80 // TODO: It may be better to default to latency-oriented scheduling, however
81 // LLVM's current latency-oriented scheduler can't handle physreg definitions
82 // such as SystemZ has with PSW, so set this to the register-pressure
83 // scheduler, because it can.
84 setSchedulingPreference(SchedulingForRegPressure);
86 setBooleanContents(ZeroOrOneBooleanContent);
88 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
89 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
90 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
91 setOperationAction(ISD::BR_CC, MVT::i64, Custom);
92 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
93 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
94 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
95 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
96 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
97 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
98 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
100 setOperationAction(ISD::SDIV, MVT::i32, Expand);
101 setOperationAction(ISD::UDIV, MVT::i32, Expand);
102 setOperationAction(ISD::SDIV, MVT::i64, Expand);
103 setOperationAction(ISD::UDIV, MVT::i64, Expand);
104 setOperationAction(ISD::SREM, MVT::i32, Expand);
105 setOperationAction(ISD::UREM, MVT::i32, Expand);
106 setOperationAction(ISD::SREM, MVT::i64, Expand);
107 setOperationAction(ISD::UREM, MVT::i64, Expand);
109 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
111 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
112 setOperationAction(ISD::CTPOP, MVT::i64, Expand);
113 setOperationAction(ISD::CTTZ, MVT::i32, Expand);
114 setOperationAction(ISD::CTTZ, MVT::i64, Expand);
115 setOperationAction(ISD::CTLZ, MVT::i32, Promote);
116 setOperationAction(ISD::CTLZ, MVT::i64, Legal);
118 // FIXME: Can we lower these 2 efficiently?
119 setOperationAction(ISD::SETCC, MVT::i32, Expand);
120 setOperationAction(ISD::SETCC, MVT::i64, Expand);
121 setOperationAction(ISD::SETCC, MVT::f32, Expand);
122 setOperationAction(ISD::SETCC, MVT::f64, Expand);
123 setOperationAction(ISD::SELECT, MVT::i32, Expand);
124 setOperationAction(ISD::SELECT, MVT::i64, Expand);
125 setOperationAction(ISD::SELECT, MVT::f32, Expand);
126 setOperationAction(ISD::SELECT, MVT::f64, Expand);
127 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
128 setOperationAction(ISD::SELECT_CC, MVT::i64, Custom);
129 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
130 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
132 setOperationAction(ISD::MULHS, MVT::i64, Expand);
133 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
135 // FIXME: Can we support these natively?
136 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
137 setOperationAction(ISD::SRL_PARTS, MVT::i64, Expand);
138 setOperationAction(ISD::SHL_PARTS, MVT::i64, Expand);
139 setOperationAction(ISD::SRA_PARTS, MVT::i64, Expand);
141 // Lower some FP stuff
142 setOperationAction(ISD::FSIN, MVT::f32, Expand);
143 setOperationAction(ISD::FSIN, MVT::f64, Expand);
144 setOperationAction(ISD::FCOS, MVT::f32, Expand);
145 setOperationAction(ISD::FCOS, MVT::f64, Expand);
146 setOperationAction(ISD::FREM, MVT::f32, Expand);
147 setOperationAction(ISD::FREM, MVT::f64, Expand);
149 // We have only 64-bit bitconverts
150 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand);
151 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand);
153 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
154 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
155 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
156 setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
158 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
161 SDValue SystemZTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
162 switch (Op.getOpcode()) {
163 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
164 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
165 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
166 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
167 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
169 llvm_unreachable("Should not custom lower this!");
174 bool SystemZTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
175 if (UseSoftFloat || (VT != MVT::f32 && VT != MVT::f64))
182 return Imm.isZero() || Imm.isNegZero();
185 //===----------------------------------------------------------------------===//
186 // SystemZ Inline Assembly Support
187 //===----------------------------------------------------------------------===//
189 /// getConstraintType - Given a constraint letter, return the type of
190 /// constraint it is for this target.
191 TargetLowering::ConstraintType
192 SystemZTargetLowering::getConstraintType(const std::string &Constraint) const {
193 if (Constraint.size() == 1) {
194 switch (Constraint[0]) {
196 return C_RegisterClass;
201 return TargetLowering::getConstraintType(Constraint);
204 std::pair<unsigned, const TargetRegisterClass*>
205 SystemZTargetLowering::
206 getRegForInlineAsmConstraint(const std::string &Constraint,
208 if (Constraint.size() == 1) {
209 // GCC Constraint Letters
210 switch (Constraint[0]) {
212 case 'r': // GENERAL_REGS
214 return std::make_pair(0U, SystemZ::GR32RegisterClass);
215 else if (VT == MVT::i128)
216 return std::make_pair(0U, SystemZ::GR128RegisterClass);
218 return std::make_pair(0U, SystemZ::GR64RegisterClass);
222 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
225 //===----------------------------------------------------------------------===//
226 // Calling Convention Implementation
227 //===----------------------------------------------------------------------===//
229 #include "SystemZGenCallingConv.inc"
232 SystemZTargetLowering::LowerFormalArguments(SDValue Chain,
233 CallingConv::ID CallConv,
235 const SmallVectorImpl<ISD::InputArg>
239 SmallVectorImpl<SDValue> &InVals) {
243 llvm_unreachable("Unsupported calling convention");
245 case CallingConv::Fast:
246 return LowerCCCArguments(Chain, CallConv, isVarArg, Ins, dl, DAG, InVals);
251 SystemZTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
252 CallingConv::ID CallConv, bool isVarArg,
254 const SmallVectorImpl<ISD::OutputArg> &Outs,
255 const SmallVectorImpl<ISD::InputArg> &Ins,
256 DebugLoc dl, SelectionDAG &DAG,
257 SmallVectorImpl<SDValue> &InVals) {
258 // SystemZ target does not yet support tail call optimization.
263 llvm_unreachable("Unsupported calling convention");
264 case CallingConv::Fast:
266 return LowerCCCCallTo(Chain, Callee, CallConv, isVarArg, isTailCall,
267 Outs, Ins, dl, DAG, InVals);
271 /// LowerCCCArguments - transform physical registers into virtual registers and
272 /// generate load operations for arguments places on the stack.
273 // FIXME: struct return stuff
276 SystemZTargetLowering::LowerCCCArguments(SDValue Chain,
277 CallingConv::ID CallConv,
279 const SmallVectorImpl<ISD::InputArg>
283 SmallVectorImpl<SDValue> &InVals) {
285 MachineFunction &MF = DAG.getMachineFunction();
286 MachineFrameInfo *MFI = MF.getFrameInfo();
287 MachineRegisterInfo &RegInfo = MF.getRegInfo();
289 // Assign locations to all of the incoming arguments.
290 SmallVector<CCValAssign, 16> ArgLocs;
291 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
292 ArgLocs, *DAG.getContext());
293 CCInfo.AnalyzeFormalArguments(Ins, CC_SystemZ);
296 report_fatal_error("Varargs not supported yet");
298 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
300 CCValAssign &VA = ArgLocs[i];
301 EVT LocVT = VA.getLocVT();
303 // Arguments passed in registers
304 TargetRegisterClass *RC;
305 switch (LocVT.getSimpleVT().SimpleTy) {
308 errs() << "LowerFormalArguments Unhandled argument type: "
309 << LocVT.getSimpleVT().SimpleTy
314 RC = SystemZ::GR64RegisterClass;
317 RC = SystemZ::FP32RegisterClass;
320 RC = SystemZ::FP64RegisterClass;
324 unsigned VReg = RegInfo.createVirtualRegister(RC);
325 RegInfo.addLiveIn(VA.getLocReg(), VReg);
326 ArgValue = DAG.getCopyFromReg(Chain, dl, VReg, LocVT);
329 assert(VA.isMemLoc());
331 // Create the nodes corresponding to a load from this parameter slot.
332 // Create the frame index object for this incoming parameter...
333 int FI = MFI->CreateFixedObject(LocVT.getSizeInBits()/8,
334 VA.getLocMemOffset(), true, false);
336 // Create the SelectionDAG nodes corresponding to a load
337 // from this parameter
338 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
339 ArgValue = DAG.getLoad(LocVT, dl, Chain, FIN,
340 PseudoSourceValue::getFixedStack(FI), 0,
344 // If this is an 8/16/32-bit value, it is really passed promoted to 64
345 // bits. Insert an assert[sz]ext to capture this, then truncate to the
347 if (VA.getLocInfo() == CCValAssign::SExt)
348 ArgValue = DAG.getNode(ISD::AssertSext, dl, LocVT, ArgValue,
349 DAG.getValueType(VA.getValVT()));
350 else if (VA.getLocInfo() == CCValAssign::ZExt)
351 ArgValue = DAG.getNode(ISD::AssertZext, dl, LocVT, ArgValue,
352 DAG.getValueType(VA.getValVT()));
354 if (VA.getLocInfo() != CCValAssign::Full)
355 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
357 InVals.push_back(ArgValue);
363 /// LowerCCCCallTo - functions arguments are copied from virtual regs to
364 /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
367 SystemZTargetLowering::LowerCCCCallTo(SDValue Chain, SDValue Callee,
368 CallingConv::ID CallConv, bool isVarArg,
370 const SmallVectorImpl<ISD::OutputArg>
372 const SmallVectorImpl<ISD::InputArg> &Ins,
373 DebugLoc dl, SelectionDAG &DAG,
374 SmallVectorImpl<SDValue> &InVals) {
376 MachineFunction &MF = DAG.getMachineFunction();
378 // Offset to first argument stack slot.
379 const unsigned FirstArgOffset = 160;
381 // Analyze operands of the call, assigning locations to each operand.
382 SmallVector<CCValAssign, 16> ArgLocs;
383 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
384 ArgLocs, *DAG.getContext());
386 CCInfo.AnalyzeCallOperands(Outs, CC_SystemZ);
388 // Get a count of how many bytes are to be pushed on the stack.
389 unsigned NumBytes = CCInfo.getNextStackOffset();
391 Chain = DAG.getCALLSEQ_START(Chain ,DAG.getConstant(NumBytes,
392 getPointerTy(), true));
394 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
395 SmallVector<SDValue, 12> MemOpChains;
398 // Walk the register/memloc assignments, inserting copies/loads.
399 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
400 CCValAssign &VA = ArgLocs[i];
402 SDValue Arg = Outs[i].Val;
404 // Promote the value if needed.
405 switch (VA.getLocInfo()) {
406 default: assert(0 && "Unknown loc info!");
407 case CCValAssign::Full: break;
408 case CCValAssign::SExt:
409 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
411 case CCValAssign::ZExt:
412 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
414 case CCValAssign::AExt:
415 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
419 // Arguments that can be passed on register must be kept at RegsToPass
422 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
424 assert(VA.isMemLoc());
426 if (StackPtr.getNode() == 0)
428 DAG.getCopyFromReg(Chain, dl,
429 (RegInfo->hasFP(MF) ?
430 SystemZ::R11D : SystemZ::R15D),
433 unsigned Offset = FirstArgOffset + VA.getLocMemOffset();
434 SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(),
436 DAG.getIntPtrConstant(Offset));
438 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
439 PseudoSourceValue::getStack(), Offset,
444 // Transform all store nodes into one single node because all store nodes are
445 // independent of each other.
446 if (!MemOpChains.empty())
447 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
448 &MemOpChains[0], MemOpChains.size());
450 // Build a sequence of copy-to-reg nodes chained together with token chain and
451 // flag operands which copy the outgoing args into registers. The InFlag in
452 // necessary since all emited instructions must be stuck together.
454 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
455 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
456 RegsToPass[i].second, InFlag);
457 InFlag = Chain.getValue(1);
460 // If the callee is a GlobalAddress node (quite common, every direct call is)
461 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
462 // Likewise ExternalSymbol -> TargetExternalSymbol.
463 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
464 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), getPointerTy());
465 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
466 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), getPointerTy());
468 // Returns a chain & a flag for retval copy to use.
469 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
470 SmallVector<SDValue, 8> Ops;
471 Ops.push_back(Chain);
472 Ops.push_back(Callee);
474 // Add argument registers to the end of the list so that they are
475 // known live into the call.
476 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
477 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
478 RegsToPass[i].second.getValueType()));
480 if (InFlag.getNode())
481 Ops.push_back(InFlag);
483 Chain = DAG.getNode(SystemZISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
484 InFlag = Chain.getValue(1);
486 // Create the CALLSEQ_END node.
487 Chain = DAG.getCALLSEQ_END(Chain,
488 DAG.getConstant(NumBytes, getPointerTy(), true),
489 DAG.getConstant(0, getPointerTy(), true),
491 InFlag = Chain.getValue(1);
493 // Handle result values, copying them out of physregs into vregs that we
495 return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins, dl,
499 /// LowerCallResult - Lower the result values of a call into the
500 /// appropriate copies out of appropriate physical registers.
503 SystemZTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
504 CallingConv::ID CallConv, bool isVarArg,
505 const SmallVectorImpl<ISD::InputArg>
507 DebugLoc dl, SelectionDAG &DAG,
508 SmallVectorImpl<SDValue> &InVals) {
510 // Assign locations to each value returned by this call.
511 SmallVector<CCValAssign, 16> RVLocs;
512 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), RVLocs,
515 CCInfo.AnalyzeCallResult(Ins, RetCC_SystemZ);
517 // Copy all of the result registers out of their specified physreg.
518 for (unsigned i = 0; i != RVLocs.size(); ++i) {
519 CCValAssign &VA = RVLocs[i];
521 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
522 VA.getLocVT(), InFlag).getValue(1);
523 SDValue RetValue = Chain.getValue(0);
524 InFlag = Chain.getValue(2);
526 // If this is an 8/16/32-bit value, it is really passed promoted to 64
527 // bits. Insert an assert[sz]ext to capture this, then truncate to the
529 if (VA.getLocInfo() == CCValAssign::SExt)
530 RetValue = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), RetValue,
531 DAG.getValueType(VA.getValVT()));
532 else if (VA.getLocInfo() == CCValAssign::ZExt)
533 RetValue = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), RetValue,
534 DAG.getValueType(VA.getValVT()));
536 if (VA.getLocInfo() != CCValAssign::Full)
537 RetValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), RetValue);
539 InVals.push_back(RetValue);
547 SystemZTargetLowering::LowerReturn(SDValue Chain,
548 CallingConv::ID CallConv, bool isVarArg,
549 const SmallVectorImpl<ISD::OutputArg> &Outs,
550 DebugLoc dl, SelectionDAG &DAG) {
552 // CCValAssign - represent the assignment of the return value to a location
553 SmallVector<CCValAssign, 16> RVLocs;
555 // CCState - Info about the registers and stack slot.
556 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
557 RVLocs, *DAG.getContext());
559 // Analize return values.
560 CCInfo.AnalyzeReturn(Outs, RetCC_SystemZ);
562 // If this is the first return lowered for this function, add the regs to the
563 // liveout set for the function.
564 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
565 for (unsigned i = 0; i != RVLocs.size(); ++i)
566 if (RVLocs[i].isRegLoc())
567 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
572 // Copy the result values into the output registers.
573 for (unsigned i = 0; i != RVLocs.size(); ++i) {
574 CCValAssign &VA = RVLocs[i];
575 SDValue ResValue = Outs[i].Val;
576 assert(VA.isRegLoc() && "Can only return in registers!");
578 // If this is an 8/16/32-bit value, it is really should be passed promoted
580 if (VA.getLocInfo() == CCValAssign::SExt)
581 ResValue = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), ResValue);
582 else if (VA.getLocInfo() == CCValAssign::ZExt)
583 ResValue = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), ResValue);
584 else if (VA.getLocInfo() == CCValAssign::AExt)
585 ResValue = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), ResValue);
587 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), ResValue, Flag);
589 // Guarantee that all emitted copies are stuck together,
590 // avoiding something bad.
591 Flag = Chain.getValue(1);
595 return DAG.getNode(SystemZISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
598 return DAG.getNode(SystemZISD::RET_FLAG, dl, MVT::Other, Chain);
601 SDValue SystemZTargetLowering::EmitCmp(SDValue LHS, SDValue RHS,
602 ISD::CondCode CC, SDValue &SystemZCC,
604 // FIXME: Emit a test if RHS is zero
606 bool isUnsigned = false;
607 SystemZCC::CondCodes TCC;
610 llvm_unreachable("Invalid integer condition!");
616 TCC = SystemZCC::NLH;
632 if (LHS.getValueType().isFloatingPoint()) {
636 isUnsigned = true; // FALLTHROUGH
642 if (LHS.getValueType().isFloatingPoint()) {
646 isUnsigned = true; // FALLTHROUGH
652 if (LHS.getValueType().isFloatingPoint()) {
653 TCC = SystemZCC::NLE;
656 isUnsigned = true; // FALLTHROUGH
662 if (LHS.getValueType().isFloatingPoint()) {
663 TCC = SystemZCC::NHE;
666 isUnsigned = true; // FALLTHROUGH
673 SystemZCC = DAG.getConstant(TCC, MVT::i32);
675 DebugLoc dl = LHS.getDebugLoc();
676 return DAG.getNode((isUnsigned ? SystemZISD::UCMP : SystemZISD::CMP),
677 dl, MVT::i64, LHS, RHS);
681 SDValue SystemZTargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) {
682 SDValue Chain = Op.getOperand(0);
683 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
684 SDValue LHS = Op.getOperand(2);
685 SDValue RHS = Op.getOperand(3);
686 SDValue Dest = Op.getOperand(4);
687 DebugLoc dl = Op.getDebugLoc();
690 SDValue Flag = EmitCmp(LHS, RHS, CC, SystemZCC, DAG);
691 return DAG.getNode(SystemZISD::BRCOND, dl, Op.getValueType(),
692 Chain, Dest, SystemZCC, Flag);
695 SDValue SystemZTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) {
696 SDValue LHS = Op.getOperand(0);
697 SDValue RHS = Op.getOperand(1);
698 SDValue TrueV = Op.getOperand(2);
699 SDValue FalseV = Op.getOperand(3);
700 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
701 DebugLoc dl = Op.getDebugLoc();
704 SDValue Flag = EmitCmp(LHS, RHS, CC, SystemZCC, DAG);
706 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Flag);
707 SmallVector<SDValue, 4> Ops;
708 Ops.push_back(TrueV);
709 Ops.push_back(FalseV);
710 Ops.push_back(SystemZCC);
713 return DAG.getNode(SystemZISD::SELECT, dl, VTs, &Ops[0], Ops.size());
716 SDValue SystemZTargetLowering::LowerGlobalAddress(SDValue Op,
718 DebugLoc dl = Op.getDebugLoc();
719 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
720 int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
722 bool IsPic = getTargetMachine().getRelocationModel() == Reloc::PIC_;
723 bool ExtraLoadRequired =
724 Subtarget.GVRequiresExtraLoad(GV, getTargetMachine(), false);
727 if (!IsPic && !ExtraLoadRequired) {
728 Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), Offset);
731 unsigned char OpFlags = 0;
732 if (ExtraLoadRequired)
733 OpFlags = SystemZII::MO_GOTENT;
735 Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), 0, OpFlags);
738 Result = DAG.getNode(SystemZISD::PCRelativeWrapper, dl,
739 getPointerTy(), Result);
741 if (ExtraLoadRequired)
742 Result = DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(), Result,
743 PseudoSourceValue::getGOT(), 0, false, false, 0);
745 // If there was a non-zero offset that we didn't fold, create an explicit
748 Result = DAG.getNode(ISD::ADD, dl, getPointerTy(), Result,
749 DAG.getConstant(Offset, getPointerTy()));
755 SDValue SystemZTargetLowering::LowerJumpTable(SDValue Op,
757 DebugLoc dl = Op.getDebugLoc();
758 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
759 SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), getPointerTy());
761 return DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result);
766 // FIXME: This is just dirty hack. We need to lower cpool properly
767 SDValue SystemZTargetLowering::LowerConstantPool(SDValue Op,
769 DebugLoc dl = Op.getDebugLoc();
770 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
772 SDValue Result = DAG.getTargetConstantPool(CP->getConstVal(), getPointerTy(),
776 return DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result);
779 const char *SystemZTargetLowering::getTargetNodeName(unsigned Opcode) const {
781 case SystemZISD::RET_FLAG: return "SystemZISD::RET_FLAG";
782 case SystemZISD::CALL: return "SystemZISD::CALL";
783 case SystemZISD::BRCOND: return "SystemZISD::BRCOND";
784 case SystemZISD::CMP: return "SystemZISD::CMP";
785 case SystemZISD::UCMP: return "SystemZISD::UCMP";
786 case SystemZISD::SELECT: return "SystemZISD::SELECT";
787 case SystemZISD::PCRelativeWrapper: return "SystemZISD::PCRelativeWrapper";
788 default: return NULL;
792 //===----------------------------------------------------------------------===//
793 // Other Lowering Code
794 //===----------------------------------------------------------------------===//
797 SystemZTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
798 MachineBasicBlock *BB,
799 DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const {
800 const SystemZInstrInfo &TII = *TM.getInstrInfo();
801 DebugLoc dl = MI->getDebugLoc();
802 assert((MI->getOpcode() == SystemZ::Select32 ||
803 MI->getOpcode() == SystemZ::SelectF32 ||
804 MI->getOpcode() == SystemZ::Select64 ||
805 MI->getOpcode() == SystemZ::SelectF64) &&
806 "Unexpected instr type to insert");
808 // To "insert" a SELECT instruction, we actually have to insert the diamond
809 // control-flow pattern. The incoming instruction knows the destination vreg
810 // to set, the condition code register to branch on, the true/false values to
811 // select between, and a branch opcode to use.
812 const BasicBlock *LLVM_BB = BB->getBasicBlock();
813 MachineFunction::iterator I = BB;
821 // fallthrough --> copy0MBB
822 MachineBasicBlock *thisMBB = BB;
823 MachineFunction *F = BB->getParent();
824 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
825 MachineBasicBlock *copy1MBB = F->CreateMachineBasicBlock(LLVM_BB);
826 SystemZCC::CondCodes CC = (SystemZCC::CondCodes)MI->getOperand(3).getImm();
827 BuildMI(BB, dl, TII.getBrCond(CC)).addMBB(copy1MBB);
828 F->insert(I, copy0MBB);
829 F->insert(I, copy1MBB);
830 // Inform sdisel of the edge changes.
831 for (MachineBasicBlock::succ_iterator SI = BB->succ_begin(),
832 SE = BB->succ_end(); SI != SE; ++SI)
833 EM->insert(std::make_pair(*SI, copy1MBB));
834 // Update machine-CFG edges by transferring all successors of the current
835 // block to the new block which will contain the Phi node for the select.
836 copy1MBB->transferSuccessors(BB);
837 // Next, add the true and fallthrough blocks as its successors.
838 BB->addSuccessor(copy0MBB);
839 BB->addSuccessor(copy1MBB);
843 // # fallthrough to copy1MBB
846 // Update machine-CFG edges
847 BB->addSuccessor(copy1MBB);
850 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
853 BuildMI(BB, dl, TII.get(SystemZ::PHI),
854 MI->getOperand(0).getReg())
855 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
856 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
858 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.